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CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Income Statement [Abstract] |  |
Revenue | $ 55,380 | $ 47,983
Cost of goods sold | 4,833 | 5,112
Gross profit | 50,547 | 42,871
Operating expenses: |  |
Sales and marketing | 44,497 | 41,646
Research and development | 5,376 | 5,513
General and administrative | 12,639 | 13,062
Total operating expenses | 62,512 | 60,221
Loss from operations | (11,965) | (17,350)
Interest and other income (expense), net: |  |
Interest income | 769 | 175
Interest expense | (5,108) | (6,204)
Other income (expense), net | (1,149) | 340
Net loss | (17,453) | (23,039)
Other comprehensive income: |  |
Unrealized gain of marketable securities | 10 | 0
Changes in foreign currency translation | 27 | (70)
Comprehensive loss | $ (17,416) | $ (23,109)
Net loss per share, basic and diluted (in dollars per share) | $ (2.20) | $ (6.65)
Weighted-average number of common shares used to compute basic and diluted net loss per share (in shares) | 7,950,284 | 3,467,096

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